Gear-generating machine.



R. WALLWORK. GEAR GENERATING MACHINE.

APPLIGATION FILED NOV. 9,1907.

Patented Mar. 23, 1909.

3 SHEETS-SHEET 1.

R. WALLWORK. GEAR GENERATING MACHINE. APPLICATION FILED NOV.9,1907.

Patented Mar. 23, 1909.

3 SHEETS-411E111 2.

R. WALLWORK. GEAR GENERATING MACHINE.

APPLICATION FILED NOV.9,1907.

9 1 5,8 1 1 Patented Mar. 23, 1909.

3 SHEETS-SHEET 3.

ROUGHSEDGE WALLWORK, OF MANCHESTER, ENGLAND.

fifiAR-GENERATING MACHINE.

Specification of Letters Patent.

Application filed. November 9, 1907 Patented March 23, 1909.

Serial No. 401,467.

To all whom it may concern:

Be it known that I, ROUGHSEDGE \VALL WORK, :1. subject of the King'of Great Britain, residing at Union Bridge Ironworks, Roger street, Manchester, in the county of Lancaster, England, have invented a new and useful Improvement in Gcar-Gonerating Machines, of which the following is a speciiication.

The improvement relates to gear generating machines and has for object to provide a machine wherein may be cut the teeth of spurs, spirals, worm wheels, worms, or wherein circular milling may be accomlishcd, Whether such spurs be cut with a 10b, or a single cutter, or the worm wheels be cut with hobs or fly cutters, and similarly for the spiral gears, in the manner hereinafter to be described. Flat or hollow faced gears may also be out upon the machine aforesaid, as desired.

For the purpose of more clearly dvsrriblug the present invention, reference is made to the accompanying sheets of drawings, wherem- Figure 1 is a side elevation of tho niain l portion of the gear generating machine. with the carriage part thorool ill sci-tron. Fig.

is a front VlBW of tho machine. the carriage,

for the sake of clcarnvss, and Fig. i is a plan View of the machine. the table included. all according to one form of my invention. Fig. 4 is a Ylt\\' on an enlarged scale of the top of tho rarriugo shown iir l' in l. gear whorls living ilnliratrd hi broken lines only. his. 5 is a dolnil. on :1. dilli-ront scale. of a and the carriage a sliding upon the head )ortion thereof, at right an les with the lormer. 'lho cutter 0, here siown in place of a hob, (see Fig. (i), is mounted upon a mandrel supported by the saddle c. I n Fig. 1 the mandrel 20 is shown capable of angular adjustment by the rotation around the worm shaft 21, as an axis, of the portion of the saddle c supporting said mandrel. such movable portion here taking the form of a circular face connection upon which the mandrel ismountcd. r

The mechanical means for obtaining the correct relative motions of the parts of the machine before named, some of which, however, not being involved in curtain cutting operations. consist in the main 'of a shaft it connected by change whorls such as i, with an ordininy driviup headstock such as j, which lirst named shaft It is connected by spiral gear A: (capahlc of sliding along the shaft 7:.) to a. vertical shaft 1 within the carriage u, said vertical shaft I living also conncctc-d by suitable gear wheels, such as m to the cutter (a through the mandrel upon which it is mounted. A l-n-y-way is formed in the shaft I to enable a worm 1 forming part of the gear In, to worn with the saddle 0 while i o i-irali-d by the shaft 1 (see more particularly table, and certain other parts hoing omitted Fig. 7.) 'l'ho shaft h is terminated by or providvd ith a set of dili'ercntial wheels or nest portion of tho mar-hintin ronncction with l the table thereof. Fig. n is a diunruunnatic View, arrangod lll our piano. of the main mechanical parts employed according to the form descriwd of the present invention.

Fig. 7 is a sectional ll\\' of a portion of Fig,

1, on an cnlari d srrulo.

.iho princn .l n

ing or moving transversely across the machine bod l), a saddle c mounted upon the carriage a and capable of moving vertically thereon, a table (I for the wheel or work operated upon capable of sliding or moving on the bed to and from the saddle aforesaid, which table (i is also capable of rotation. The machine lbed may be conveniently of tee shape as shown, the table I being ca able of sliding upon the leg portion of suc tee,

\lll l: parts of the machine consist of a carriage (I capable of slid- 1 of hovcls n. The said differentials are in conportion with a shaft 0, which shaft is connectod'hy worm and wheel p to a cross shaft q, the latter being co nnectod by suitable change whorls. such as r, to another shaft 8. Gear wheels it connect the shaft 8 to the worms it for the purpose of rotating the same, which worms may he put into gear with the worm wheels 1* controlling the rotary movement of the table. it is arranged that only one of the worms u can he in gear with a wheel 1' at any one time. that is to say, the rocker u u umwhich the worms are mounted is cap..- h c of hoiugrotatod or rocked upon the shaft s by means of the hand lover I, from which it will he soon that when one of the worms is in gear with its corresponding wheel v, the other worms, for the some or similar purpose.

higher speed only; the difference iii pitch of F the two worms bring suitably arranged to all low of this. lt is obvious that the system i may be applied to a set oi more than two .1 feed screw y is provided forcpcrating the sliding carriage (1, which screw is rotated at 1 1hr requisite speed by means of a pair of ratchet wheels 2 operated by a pair ol. pawls l acting on opposite sides, oueloreach ratchet wheel, and thus arranged so as to give a co11- tinuous motion to the said screw. That is to say, one of the pawls 1 has not ceased to move in the one direction before the other pawl commences to move in the opposite direction. To enable this to be done, and to provide the necessary feed, the opposite ends of these pawls are connected, eccentrically, to a disk 2 mounted upon a shaft 3 operated by epicyclic gear indicated at 4 in connection with spur wheels 5 to the shaft h! In Fig. 2 the box for the e ieyclic and spur gears is merely shown, and in Fig. 6 the relative positions of the said epicychc gear and the feed screw y appear to be reversed on account of the parts in the latterfi are being brought into one plane. The said i eed screw y is also in gear connection, when requisite, through an extra shaft 6, with the idler wheels f, carried by the usual spur rim indicated of the differ- 1 the requisite transverse change whee ential car 11,, whereb the retardation or acceleration, of the wor being cut may be obtained.

The retardation, or acceleration, of rotation of the work being cut, may be combined with the vertical movement of the saddle 0, such as in' the cutting of spirals, by emplo ing a vertical rack 7 attached to such sadd e, and in gear connection as at 8 with a shaft 9, which through suitable change wheel's, such as 10, operates the shaft 6 connected by ear wheels 11 to, and driving the idler whee s of the differential gear n. Or, as an alternative, in some cases, the carna e a may be allowed to slide laterally while t e saddle c is traveling down; the differential gear being locked, and the correct feed obtained by change wheelsonly between shaft 9 and screw 'y (the rack 7 retained to operate shaft 9), to keep the rotations of cutter or hob and the table d upon which the work is mounted, relatively correct; or the traverse of the carriage is combined with the vertical motion of the saddle to give a resulting motion otherwise obtained with the use of the differential ear. The wheel table 0? may be moved to or mm the saddle c or cutter thereon, by means of a hand wheel, (afacing for which is shown at 12 in Fig. 2) or b mechanical feed, as is well understood. The table d in Fig. 3 is thus'shown closer to the saddle 0 than it is in 1 Fi l. c

ior cutting worm wheels, when retardation-or acceleration of rotation of the wheel being cut is combined with a horizontal travel of the cutter or hob across the face of the'said wheel, motion may be transmitted from the head-stock through the parts i, h, 5, 4, 3, 2, 1, z, to the feed screw 3 tor giving or horizontal motion to the carriage a carrying the saddle 0 along with the cutter e, the said cutter being rotated, with its mandrel, through the gearinp;

m in connection with the vertical shaft The retardation, or acceleration, of the table d may be obtained through the operation of the connected parts y, 6, 11, n, o, p, g, 1', s, t, u, v.

For cutting spur gears, when a rotatin hob at the correct angle has a vertical fee as the table rotates; chan e .wheels bein used to keep the rotation 0 hoband whee correct; the vertical motion of the said hob may be obtained by the 0 eration of a vertical screw 14 attached to t e saddle c, in gear connectionwith shaft l throu h gearing 15, shaft 16, and gearing 17, (see i igs. 4 and 1).

For finevertic'al feeds, the gear connection named may consist of or be combined with an epicyclic ear 18 in combination with the or gearingl 5 and 1 7. A bracket for the application of evel wheels or hand feed device for the screw 14 is shown at 19 in Fi s. 4 and 1. a

or cuttin worms, the work may be mounted vertically upon the table, the axis of the hob or cutter being suitably arranged to correspond. For the vertica feed the true ratio may be obtained from the shaft l to the screw 14, through the caring l5 and 1.7, the epicyclic gear 18 not oing required. The necessary rotation of the table 11 maybe provided by the use of change wheels, the

differential gear n being locked.

For cuttin spirals, the e not required or the vertica feed, but the retardation or acceleration of the rotation of the table to be combined with such vertical feed may be obtained by theme of the rack 7 operating the connected parts 9, 6, 11, n o, p, g, r, s, t, a, c; or the alternative method of dis ensin with the rack arrangement, by uti izing t e lateral movement of the carriage a with the vertical feed, may be used, as already described. The epicyclics l8 and 4 are for the purpose of obtaining great reduction of speed within small spaces.

For circular millinlg, clamped in position, t e ed in the place of the hob or cutter at the required angle.

The relative positions of the axes of the hob and the wheel being cut for the cutting of hollow faces gears, such as worm wheels, ma be arranged in the ordinary manner we understooi I claim In a gear generating machine, and in combination, a carriage mounted for transverse movement is the a wheel-chord ioyclic gear 18 is the work may be. milling tool mount- 4 lkitrilllfil to the axis of the hob mandrel, u outter or hols, mounted u on eaid carriage, a vertical ehnl't, lnounter upon the carriage and. in gear eonneetion with said cutter or hob, a main shaft, in gear connection with said vertical shaft, an epieyclic gear, in gear connection with said main shaft, :1 disk, op r-rutml. by said epieyelie, :1 pair of pawls, operated by mid disk, :1 pair of ratchet wheels, operated by said puwls, u l'eerl screw, engaging said carriage [or transverse movement thereof, and connected to said ratch- 5 eta, u \lillerential gear, in connection with the main sh aft and controlled by the said l'eed screw, and :1 table, in gear connection with i S21ll cliii'erentizil gem, substantially as herein l set forth.

In witness whereof I have hereunto set my hand in presence of two witnesses.

i'iOUU-HSEDGE WALLWOHlx'.

\Vitneess: W

ARTHUR GADD, THOMAS PARTING'ION. 

